<template>
    <div  class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入要评论的内容(最多120字)" maxlength="120" v-model="msg"></textarea>

        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>

        <div class="cmt-list">
            <div class="cmt-item" v-for="(item, i) in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{ i+1 }}楼&nbsp;&nbsp;用户：{{ item.user_name }}&nbsp;&nbsp;发表时间：{{ item.add_time | dateFormat }}
                </div>
                <div class="cmt-body">
                    {{ item.content === 'undefined' ? '此用户很懒，嘛都没说': item.content }}
                </div>
            </div>
        </div>

        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>

<script>
    import { Toast } from "mint-ui";
 export default {
     props: ["id"],
     data () {
         return {
             pageIndex: 1, // 默认展示第一页数据
             comments: [], // 所有的评论数据
             msg: "" // 评论输入的内容
         }
     },
     created() {
         this.getComments();
     },
     methods: {
         async getComments () {
             const { data: res } = await this.$http.get(`api/getcomments/${this.id}?pageindex=${this.pageIndex}`)
             if (res.status !== 0) { return Toast('获取评论失败！')}
             else {
                 this.comments = this.comments.concat(res.message)
             }
         },
         getMore () {
             this.pageIndex++
             this.getComments();
         },
         async postComment () {
             if (this.msg.trim() == '') {
                 return Toast('请输入要评论的内容！')
             }
             else {
                 const { data: res } = await this.$http.post(`api/postcomment/${this.id}`, {
                     content: this.msg.trim()
                 })
                 if (res.status !== 0) {
                     Toast('发表评论失败！')
                 }
             else {
                 const newcomment = {
                         user_name: "匿名用户",
                         add_time: Date.now(),
                         content: this.msg.trim()
                     }
                     this.comments.unshift(newcomment)
                     this.msg = ''
                 }
             }
         }
     }
 }
</script>

<style lang="less" scoped>
    .cmt-container {
        h3 {
            font-size: 18px;
        }

        textarea {
            font-size: 14px;
            height: 85px;
            margin: 0;
        }
        .cmt-list {
            margin: 5px 0;
            .cmt-item {
                font-size: 13px;
                .cmt-title {
                    line-height: 30px;
                    background-color: #ccc;
                }
                .cmt-body {
                    line-height: 35px;
                    text-indent: 2em;
                }
            }
        }
    }
</style>
